Answer:
The answer is C.
Explanation:
Examples of the Five Themes of Geography
Location: Coordinates and Relative Distance.
Human–Environment interaction: Altering the Environment.
Place: Human and Environmental Differences.
Region: Broad Groupings.
Movement: Transmission of Goods and Services.
Niger and Congo are two rivers after which countries are named (actually in both cases two countries each) - and those are African countries, so they must be in Africa.
Zambezi is a river in Angola and Namibia.
Tigris is a River in Mesopotamia, in Asia - so that's the correct answer!